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Finding the Fourth Proportional to 72.89, 100.55 and 48.30

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Solution

The fourth proportional to 72.89, 100.55 and 48.30 is: 66.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.89 : 100.55 = 48.30 : x
  2. Step 2: Convert to fraction form
    72.89/100.55 = 48.30/x
  3. Step 3: Cross multiply
    72.89x = 100.55 × 48.30
  4. Step 4: Simplify right side
    72.89x = 4,856.06
  5. Step 5: Solve for x
    x = 4,856.06/72.89
  6. Step 6: Final answer
    x = 66.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.